The "Small 4 Years Later" Update:
-Removed Difficulty Settings (May be reimplemented later)
-Changed Character Eye Size Slider from Integer to Float (It supports Decimals now)
-Probably Changed a few other things (I worked on this with such long breaks I don't remember. Sorry)

Version 1.5:
+Added Half-life 2's Difficulty Options
+Added A Toggle for Enabling Particles
+Added Some other misc settings that I can't remember what they all are

Version 1.4 Hotfix:

-Removed a useless slider from the spawnmenu.

Version 1.4:

+Added Misc Options to the Spawnmenu
+Added Layers of Detail Slider
+Added Classic Crosshair Option
-Changed More Slider Limits

Version 1.3 Bug Fix:

-Fixed a typo in the spawnmenu extension
-Changed "Draw Viewmodel" to "Draw First-Person Weapon"

Version 1.3:
+Added "Draw Viewmodel" Setting
+Added Reset Buttons to the Spawnmenu extension
-Changed some slider limits

Version 1.2:

+Added Classic Weapon Switch Speed Option
+Added Weapon Switch Speed Slider

Version 1.1:
-Removed "Show 2D Plants" as the option had already existed in the menus and I didn't know about it.
+Added a "Show your shadow" option. (Has not been tested yet. I multitasked too hard and this was released by accident.)

Version 1.0:
+Added the "More Extra Effect Options" expansion, featuring a new menu under the "Options" tab of the spawnmenu.

Version 0.9:
+Added "Show 2D Plants" Option
-Removed "Reset Water Overlay" Option because it seemed useless.